I'd like to start a thread that is solely devoted to sharing knowledge about road conditions.

The idea is that there is a thread where someone can go to check the 'latest posts' to see if any roads are closed, if there are major hazards (ie, rockslides, snow, flooding, police-activity, construction, other) on these roads, or other important/route-changing activity.

The roads through the SM mountains aren't too bad. I've been riding through the week. As of my ride yesterday, Latigo from PCH up has quite a bit of mud over the road in the lower sections (the fire area), then it is primarily small debris throughout Latigo/Mulholland, etc. There were no major slides over the roads as of yesterday afternoon. Yerba Buena has some washout along the ridge line and descending along the top portions towards PCH.

My suggestions:

use caution on PCH as there are some flood areas that force you out into the road. There are also sections with lots of sand/mud on the shoulder so watch your line and traction.

Lots of small rocks, dirt, on canyon roads (though the caltrans crews have been much more visible this year cleaning the roads), be careful on descents.

I like to ride as far out from the cliff sections as possible as the hills are very unsettled and rocks are coming down.

The weather obviously changes with altitude--it was sunny and OK along PCH yesterday, but sheets of rain and 40+mph winds along ridgelines. When the bad weather moves back in this afternoon, be careful not to get stuck up at altitude where it will hit first...

Attn: riders in the Chevy Chase /Linda Vista area
There is construction on Linda Vista above Chevy Chase to the first turn.....will not affect uphill but the large plates in the road are on the downhill side... ( there are 5 or 6 of them spread out over a few 100 yards)
So if you are coming down Linda Vista from Lida or Figueroa, after the s turns watch for metal plates in the road. You can clear them onthe right side, but at times with the sun and shadows up there they might be hard to see!

For SD riders, I just discovered today that it IS possible to go to the top of Mt Soledad via Mt Soledad Road despite the reported closure and road repairs. All that is required is a detour via Desert View Road to bypass the slide-damaged area. You have to blow past several road blocks and signs warning that only local traffic is allowed. Eventually you will come to this barrier. where you can see construction equipment in the distance.

This where you turn right on Desert View and connect back up with Soledad Road past the work area.

Mt. Hollywood road (through Griffith park): The south side of the road has large patches of sand and debris. The sand can get very beach-volleyball thick, you'll need to consider going cyclocross-style through it. Lower on the road, large rocks. The road will not be cleared out any time soon. South side of the road refers to anything south of the road's peak at the top of Mt. Hollywood.

Descending from the Observatory, however, is perfectly clear thanks to the tourist destination on the top.

Mt. Hollywood Drive, Griffith Park, 2/5
Rode this morning, north to south. North side is fine, a few twigs here and there.South side is bad. About 7-10 mud fields in 3 sections cross the road. It's been awhile since last rain, so they're kinda dirt fields now. I rode through the top 2 or 3, no problem. Second stretch--still some wet areas with very thick, sandy mud. One section, my front wheel sank in and turned, sending me onto my side. I'm okay, was moving very slowly.

Little Tujunga Canyon Rd to Placerita Canyon Rd (Santa Clarita)
Rode this tonight from south side to north. On the lower slopes of the climb proper (as opposed to the ascending rollers), there's a "Stop Ahead" sign--part of the right lane is washed out. Road narrows to a single lane (left side) with "Proceed When Clear" directions. About a 40-foot detour total. As I was moving very slow, it concerned me. A little mud and rock debris along the side of the road, but nothing else getting in the way.

Mt. Hollywood Drive, Griffith Park
The sand-bars that had been there after the big rains of a couple weeks ago have been scraped. The rain from Wednesday didn't put any noticeable debris on the road. It left the previous dirt across the road wet in some spots and dry in others. It is definitely ride-able, just go slow, and pick a good line.